Found on a Radio Electronics this 80's circuit uses two common SCRs driving lamps. This setting appears elsewhere in this site and this section.
This circuit can be implemented with other operational amplifiers. The formulas for calculating the...
This circuit is from a 1953 publication, consisting of an AM radio with 3 germanium transistors that,...
The sensor of this circuit is a common silicon diode and it directly drives a small cooler with a...